Even with Friday's decline, the major U.S. stock benchmarks finished the week with gains.
The yen's decline has helped push Japan's stock market sharply higher.
Gregory said the timing of the decline's beginnings is suspect.
Until now, the dollar's decline has been an undoubted boon to America's economy, helping exporters without roiling financial markets.
It is one of a tiny minority of U.S. schools that decline Uncle Sam's dollars.
Thursday's decline followed a 3% drop on Wednesday, after U.S. data showed commercial oil inventories were at their highest level since 1990.
Monday's decline in oil prices follows the release of a transcript of the Federal Reserve's December meeting showing that policymakers disagreed over how long to keep a bond-purchase program in place.
PLC, one of the Reliance bond's bookrunners, attributed the decline in Reliance's bond price to a broader market correction after U.S. Treasury yields picked up.
Although the cause of the cuckoo's decline is not known, a number of theories have been discussed, said the RSPB's Grahame Madge.
The dollar's decline has strengthened the yen, making Japanese exports more expensive in the US. China's attempts to cool down its fast-growing economy have also hit Japanese industry's sales abroad.
There was a glimmer of hope this week with the return of reality show "Fear Factor, " but NBC's decline is still the biggest of the four most-watched TV networks in the U.S., among which NBC has long ranked No. 4.
For the year, that marked a gain in share for Google's operating system, but a decline for Apple's - although in terms of units sold, both firms made gains.
As Pemex's giant Cantarell field continues its steep decline, Mexico's oil output is falling.
The state's outlook is clouded by the long decline of Detroit's motor industry.
"It's apparent in organised religion there has been a decline but that's not to say there is not a spiritual side to people, " he said.
The Shanghai Composite closed down 1.1% at 2217.01 with insurers leading the market's decline.
September's decline is the largest seen since March 2003, when the economy lost 212, 000 jobs.
DeAngelo's lumber sales were down only 8%, a quarter of the lumber industry's decline.
On the sentiment front, options players are attempting to call a bottom to TXN's decline.
Exxon-supported scientists, though, say the oil spill isn't the chief cause of the fishing industry's decline.
But an inevitable series of corporate and banking defaults are likely to hasten the economy's decline.
It is maybe that proud past that makes Redcar's decline so hard to stomach.
"Google's rise is a mirror to Apple's decline, " says Colin Gillis, senior technology analyst at BGC Financial.
Mr Hocking, of the Payments Council, said the scheme's decline was "entirely driven" by businesses and consumers.
The shares have paced the SGV's decline on a year-to-date basis, dropping more than 31% since January.
The cardinals may have chosen a European to try to stem the church's decline on the continent.
This ancient fascination with courtly power has in no way been diminished by monarchy's decline in modern times.
They also established bases in the eastern Mediterranean, exploiting Byzantium's decline, gaining access to merchandise from farther east.
However, the blame for France's decline as an art market cannot all be laid on its musty auctioneers.
Then again, don't hold your breath: most economists have been predicting sterling's decline for a year or more.
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